Getting Started with AWS AutoScaling

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Auto Scaling helps you maintain application availability and allows your application to scale out automatically with increased demand, so it can handle large numbers of users with no interruption. When you enable Auto Scaling for your AWS resources, it will scale your resources up or down automatically based on conditions you define.

Auto Scaling allows you to build applications that automatically respond to changes in usage or to integrate with other AWS services like CloudWatch alarms. You can configure Auto Scaling to add or remove EC2 instances based on metrics like CPU usage, request counts, memory usage and custom metrics. This ensures that the number of instances running matches current demand. 

Some key benefits of using Auto Scaling include:

- Scaling based on demand - Automatically add or remove EC2 instances based on pre-defined CloudWatch metrics and thresholds you specify. This ensures your application always has adequate resources available to handle usage.

- Increased availability - Use Auto Scaling to maintain availability even during periods of increased demand. By scaling outward, Auto Scaling helps prevent insufficient capacity issues that could cause outages. 

- Decreased cost - With Auto Scaling, you only pay for the resources you need at a given time. It allows resources to scale down during periods of low usage, thereby saving you money compared to keeping a static number of instances running 24/7.

- Integration with other services - Auto Scaling integrates with services like Elastic Load Balancing and Amazon CloudWatch. You can configure scaling policies based on metrics from these other resources as well.

- Replace unhealthy instances - Auto Scaling can automatically terminate and replace EC2 instances that become unhealthy or perform below a threshold. This maintains application availability.

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